HTTP Authentication with PHP:
The HTTP Authentication is available when it is running as an Apache module. In this module we use the header() function to send a message (for authentication) to the client side (browser) and for doing so we pop up a user-validation window. After filling the form the url which contains the PHP script is again called with the predefined variables for authentication. $_SERVER and $HTTP_SERVER_VARS contains these predefined variables.
Instead of using simple PHP_AUTH_USER and PHP_AUTH_PW, it's may be needed to check the validity of the username and password, either by sending a (or multiple set of) query to a database, or by looking up the user in a dbm file.
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